[WIP] LaTeX Integration project

src/main/java/org/jabref/logic/texparser/DefaultTexParser.java

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+package org.jabref.logic.texparser;
+
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.jabref.model.texparser.TexParser;
+import org.jabref.model.texparser.TexParserResult;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class DefaultTexParser implements TexParser {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultTexParser.class);
+
+    /**
+     * It is allowed to add new cite commands for pattern matching.
+     *
+     * <p>Some valid examples: "citep", "[cC]ite", "[cC]ite(author|title|year|t|p)?"
+     *
+     * <p>TODO: Add support for multicite commands.
+     */
+    private static final String[] CITE_COMMANDS = {
+            "[cC]ite(alt|alp|author|authorfull|date|num|p|t|text|title|url|year|yearpar)?",
+            "([aA]|fnote|foot|footfull|full|no|[nN]ote|[pP]aren|[pP]note|[tT]ext|[sS]mart|super)cite",
+            "footcitetext"
+    };
+    private static final String CITE_GROUP = "key";
+    private static final Pattern CITE_PATTERN = Pattern.compile(
+            String.format("\\\\(%s)\\*?(?:\\[(?:[^\\]]*)\\]){0,2}\\{(?<%s>[^\\}]*)\\}",
+                    String.join("|", CITE_COMMANDS), CITE_GROUP));
+
+    private static final String INCLUDE_GROUP = "file";
+    private static final Pattern INCLUDE_PATTERN = Pattern.compile(
+            String.format("\\\\(?:include|input)\\{(?<%s>[^\\}]*)\\}", INCLUDE_GROUP));
+
+    private static final String TEX_EXT = ".tex";
+
+    private final TexParserResult result;
+
+    public DefaultTexParser() {
+        this.result = new TexParserResult();
+    }
+
+    public TexParserResult getResult() {
+        return result;
+    }
+
+    @Override
+    public TexParserResult parse(String citeString) {
+        matchCitation(Paths.get("foo/bar"), 1, citeString);
+        return result;
+    }
+
+    @Override
+    public TexParserResult parse(Path texFile) {
+        return parse(Collections.singletonList(texFile));
+    }
+
+    @Override
+    public TexParserResult parse(List<Path> texFiles) {
+        List<Path> referencedFiles = new ArrayList<>();
+
+        result.addFiles(texFiles);
+
+        for (Path file : texFiles) {
+            try (LineNumberReader lnr = new LineNumberReader(Files.newBufferedReader(file))) {
+                for (String line = lnr.readLine(); line != null; line = lnr.readLine()) {
+                    if (line.isEmpty() || line.charAt(0) == '%') {
+                        // Skip comments and blank lines.
+                        continue;
+                    }
+
+                    matchCitation(file, lnr.getLineNumber(), line);
+                    matchNestedFile(file, texFiles, referencedFiles, line);
+                }
+            } catch (IOException e) {
+                LOGGER.warn("Error opening the TEX file", e);
+            }
+        }
+
+        // Parse all files referenced by TEX files, recursively.
+        if (!referencedFiles.isEmpty()) {
+            parse(referencedFiles);
+        }
+
+        return result;
+    }
+
+    /**
+     * Find cites along a specific line and store them.
+     */
+    private void matchCitation(Path file, int lineNumber, String line) {
+        Matcher citeMatch = CITE_PATTERN.matcher(line);
+
+        while (citeMatch.find()) {
+            String[] keys = citeMatch.group(CITE_GROUP).split(",");
+
+            for (String key : keys) {
+                result.addKey(key, file, lineNumber, citeMatch.start(), citeMatch.end(), line);
+            }
+        }
+    }
+
+    /**
+     * Find inputs and includes along a specific line and store them for parsing later.
+     */
+    private void matchNestedFile(Path file, List<Path> texFiles, List<Path> referencedFiles, String line) {
+        Matcher includeMatch = INCLUDE_PATTERN.matcher(line);
+        StringBuilder include;
+
+        while (includeMatch.find()) {
+            include = new StringBuilder(includeMatch.group(INCLUDE_GROUP));
+
+            if (!include.toString().endsWith(TEX_EXT)) {
+                include.append(TEX_EXT);
+            }
+
+            Path folder = file.getParent();
+            Path inputFile = (folder == null)
+                    ? Paths.get(include.toString())
+                    : folder.resolve(include.toString());
+
+            if (!texFiles.contains(inputFile)) {
+                referencedFiles.add(inputFile);
+            }
+        }
+    }
+}

src/main/java/org/jabref/logic/texparser/TexBibEntriesResolver.java

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+package org.jabref.logic.texparser;
+
+import java.util.Optional;
+import java.util.Set;
+
+import org.jabref.model.database.BibDatabase;
+import org.jabref.model.entry.BibEntry;
+import org.jabref.model.entry.FieldName;
+import org.jabref.model.texparser.TexBibEntriesResolverResult;
+import org.jabref.model.texparser.TexParserResult;
+
+public class TexBibEntriesResolver {
+
+    private final BibDatabase masterDatabase;
+
+    public TexBibEntriesResolver(BibDatabase masterDatabase) {
+        this.masterDatabase = masterDatabase;
+    }
+
+    /**
+     * Look for BibTeX entries within the reference database for all keys inside of the TEX files.
+     * Insert these data in the list of new entries.
+     */
+    public TexBibEntriesResolverResult resolveKeys(TexParserResult texParserResult) {
+        TexBibEntriesResolverResult result = new TexBibEntriesResolverResult(texParserResult);
+        Set<String> keySet = result.getCitationsKeySet();
+
+        for (String key : keySet) {
+            if (!result.checkEntryNewDatabase(key)) {
+                Optional<BibEntry> entry = masterDatabase.getEntryByKey(key);
+
+                if (entry.isPresent()) {
+                    result.insertEntry(entry.get());
+                    resolveCrossReferences(result, entry.get());
+                } else {
+                    result.addUnresolvedKey(key);
+                }
+            }
+        }
+
+        return result;
+    }
+
+    /**
+     * Find cross references for inserting into the list of new entries.
+     */
+    private void resolveCrossReferences(TexBibEntriesResolverResult result, BibEntry entry) {
+        entry.getField(FieldName.CROSSREF).ifPresent(crossRef -> {
+            if (!result.checkEntryNewDatabase(crossRef)) {
+                Optional<BibEntry> refEntry = masterDatabase.getEntryByKey(crossRef);
+
+                if (refEntry.isPresent()) {
+                    result.insertEntry(refEntry.get());
+                    result.increaseCrossRefsCount();
+                } else {
+                    result.addUnresolvedKey(crossRef);
+                }
+            }
+        });
+    }
+}

src/main/java/org/jabref/model/texparser/Citation.java

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+package org.jabref.model.texparser;
+
+import java.nio.file.Path;
+import java.util.Objects;
+import java.util.StringJoiner;
+
+public class Citation {
+
+    /**
+     * The total number of characters that are shown around a cite (cite width included).
+     */
+    private static final int CONTEXT_WIDTH = 50;
+
+    private final Path path;
+    private final int line;
+    private final int colStart;
+    private final int colEnd;
+    private final String lineText;
+
+    public Citation(Path path, int line, int colStart, int colEnd, String lineText) {
+        if (path == null) {
+            throw new IllegalArgumentException("Path cannot be null.");
+        }
+
+        if (line <= 0) {
+            throw new IllegalArgumentException("Line has to be greater than 0.");
+        }
+
+        if (colStart < 0 || colEnd > lineText.length()) {
+            throw new IllegalArgumentException("Citation has to be between 0 and line length.");
+        }
+
+        this.path = path;
+        this.line = line;
+        this.colStart = colStart;
+        this.colEnd = colEnd;
+        this.lineText = lineText;
+    }
+
+    public Path getPath() {
+        return path;
+    }
+
+    public int getLine() {
+        return line;
+    }
+
+    public int getColStart() {
+        return colStart;
+    }
+
+    public int getColEnd() {
+        return colEnd;
+    }
+
+    public String getLineText() {
+        return lineText;
+    }
+
+    public int getContextWidth() {
+        return CONTEXT_WIDTH;
+    }
+
+    /**
+     * Get a fixed-width string that contains a cite and the text that surrounds it along the same line.
+     */
+    public String getContext() {
+        int center = (colStart + colEnd) / 2;
+        int lineLength = lineText.length();
+
+        int start = Math.max(0, (center + CONTEXT_WIDTH / 2 < lineLength)
+                ? center - CONTEXT_WIDTH / 2
+                : lineLength - CONTEXT_WIDTH);
+        int end = Math.min(lineLength, start + CONTEXT_WIDTH);
+
+        return lineText.substring(start, end);
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", getClass().getSimpleName() + "[", "]")
+                .add("path = " + path)
+                .add("line = " + line)
+                .add("colStart = " + colStart)
+                .add("colEnd = " + colEnd)
+                .add("lineText = " + lineText)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        Citation that = (Citation) o;
+
+        return Objects.equals(path, that.path)
+                && Objects.equals(line, that.line)
+                && Objects.equals(colStart, that.colStart)
+                && Objects.equals(colEnd, that.colEnd)
+                && Objects.equals(lineText, that.lineText);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(path, line, colStart, colEnd, lineText);
+    }
+}